diff options
| author | Ido Shamay <idos@mellanox.com> | 2014-11-02 17:26:15 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-03 20:28:13 +0300 |
| commit | 5f6e9800804758de367132a0fe9b85865d24f89b (patch) | |
| tree | 217874cd459ec8c75be4b3507c9fb31fed281d60 /drivers/net/ethernet/mellanox/mlx4/en_rx.c | |
| parent | 0a98455666ec87378148a1dde97f1ce5baf75a64 (diff) | |
| download | linux-5f6e9800804758de367132a0fe9b85865d24f89b.tar.xz | |
net/mlx4_en: Remove RX buffers alignment to IP_ALIGN
When IP_ALIGN has a non zero value, hardware will write to a non aligned
address. The only reader from this address is when copying the header
from the first frag into the linear buffer (further access to the IP
address will be from the linear buffer, in which the headers are
aligned). Since the penalty of non align access by the hardware is
greater than the software memcpy, changing the frag_align to always be 0.
Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/en_rx.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_rx.c | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c index c562c1468944..2ce3f00fbf38 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -74,7 +74,7 @@ static int mlx4_alloc_pages(struct mlx4_en_priv *priv, page_alloc->page_size = PAGE_SIZE << order; page_alloc->page = page; page_alloc->dma = dma; - page_alloc->page_offset = frag_info->frag_align; + page_alloc->page_offset = 0; /* Not doing get_page() for each frag is a big win * on asymetric workloads. Note we can not use atomic_set(). */ @@ -945,15 +945,8 @@ void mlx4_en_calc_rx_buf(struct net_device *dev) (eff_mtu > buf_size + frag_sizes[i]) ? frag_sizes[i] : eff_mtu - buf_size; priv->frag_info[i].frag_prefix_size = buf_size; - if (!i) { - priv->frag_info[i].frag_align = NET_IP_ALIGN; - priv->frag_info[i].frag_stride = - ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES); - } else { - priv->frag_info[i].frag_align = 0; - priv->frag_info[i].frag_stride = - ALIGN(frag_sizes[i], SMP_CACHE_BYTES); - } + priv->frag_info[i].frag_stride = ALIGN(frag_sizes[i], + SMP_CACHE_BYTES); buf_size += priv->frag_info[i].frag_size; i++; } @@ -966,11 +959,10 @@ void mlx4_en_calc_rx_buf(struct net_device *dev) eff_mtu, priv->num_frags); for (i = 0; i < priv->num_frags; i++) { en_err(priv, - " frag:%d - size:%d prefix:%d align:%d stride:%d\n", + " frag:%d - size:%d prefix:%d stride:%d\n", i, priv->frag_info[i].frag_size, priv->frag_info[i].frag_prefix_size, - priv->frag_info[i].frag_align, priv->frag_info[i].frag_stride); } } |